Motor-vehicle.



" S. B. GRAY, DEGD.

B. s. GRAY,'EXEGUTOR.

MOTOR VEHICLE.

APPLICATION FILED JULY 14, 1906.

Patented June 1, 1909.

EETS- ET S. B. GRAY, DEOD. B. S GRAY, EXEOUTB. M01103 VEHICLE. APPLICATION FILED JULY'H, 190;).

Patented June 1., 1909 v 5 SHEETS-SHEET 2. Q Fq N N S; B. GRAY, DECD.

B. SPGRAY, EXBQUTOBM 4 v I MOTOR VEHICLE. APPLICATION FILED JULY 14, 1906.

923,167; my I Q Patented June 1,1909.

Q 6 SHEETS-SHEET 4.

KIM-

UNir D sTAT s PAlENT oEEioE.

STEPHENB. GRAY, or iAoKsoNviLLE, ILLINOIS; BARTLETT s; GRAY EXEOUTOR OF SAID I STEPHEN B. GRAY, DECEASED.

Moron-VEHICLE.

To all" whom itlmay concemr Be it known that I, STEPH N B. GRAY, a

resident of Jacksonville, in the county of Morgan and State of'lllinois, have invented certain new. and useful Improvements in driven vehicles such as automobiles or traction-engines and. more particularly to the driving-mechanism whereby power is transmitted from the motor to the traction-wheels. It has heretofore been proposed to drive four wheels of the vehicle, 2'. 6., to make all of the wheels traction-wheelsand in so doing to employ the well known difi'erential gears intermediate the traction wheels to allow the vehicle to besteered. .In this differential gear-mechanism it has been found that it' there was little or no traction on either of a pair of wheels connected by means ofthe difi'erential gear, all of the power would pass to the wheel olfering the least resistance, and-resultantly at times, 0. g. when on unevenground onewheel has little or no contact withthe ground orin turning a corner, the" traction would be reduced and thus when the traction of all wheels is most desired it would be insufiicient to propel the vehicle. I

One object of the invention is to provide. a .motor-vehicle.embodying front and rear traction-Wheels ,and having mechanism \vhereby both the front and rear wheels at one side of the vehicle are positively driven at differential speed with respect to both wheels at the other side of the vehicle and to avoid the use of the common differential gears which permit the drivirig-mechanism to slip orpda'pt itself according tothe course traveled by the wheels respectively. In other words, the invention designs to provide drivingnnechanismwhereby all of the wheels are dirigible and are driven and so all oi. them will be'positively driven at proper relative speed when necessary in steering and so that each of the wheels will be driven independently otone another. p

The invention further designs to provide an improved variable speed drivii'ig-mcchanism for motor vehicles which can be changed at will and in which the speed can be g a e as desired.

The inventionconsists in the several novel features hereinafter set forth and more par Specification of Letters Patent.

Application filed.v July 14, 1906. Serial No. 326,187.

Patented June 1', 1909.

' ticularly defined hy the claims at the con clusion hereof.

In the drawings: Figure 1, is a plan view of a frame, the wheels "and driving-mechanism of a motor vehicle embodying the invention. Fig. 2 is a side elevation. Fig. 3

is a horizontal section on line 3-3 of Fig. 2. F at is a vertical section taken on line 4 4: of Fig. 2. Fig. 5 is a vertical section on line of Fig. 1. Fig. (3 is a. verticalsection on line 6-'6 of Fig. 1. Fig. 7 is a detail view partly in elevation and partly in section of the gear mechanism for driving the traction wheels.

A denotes the supporting-frame which may be of any suitable construction, B and B the front traction-wheels, and (l and C the rear traction-wheels. Each of the tractionwheels is dirigible (see Figs. 1 and 7 and iournaled on a spindle or shaft which is provided with a vcrtica lly extending hub 21 having a swiveled connection with ayoke A shaft or pin 23 is journaled in the yokeand extends through hub 21 to connect the wheels to the frame in such manner that they can be swung laterally about the swivcled connection to cause the vehicle to travel in the desired direction. Yokes 2 for the front-wheels aresecured to an axle 25 and each of the wheel-spindles has connected thereto an arm 27. The arms 27 for the front wheels are cross-connected by a bar 28 i pinions 31 and32 journaled on shaft 23, a

beveled pinion 33 on a shortshaft 3% and engaging with pinion 32 and meshing with a gear -35 which is mounted on a shaft 36, which has a suitable connection with the variable driving-mochanism. Shafts 34 and are journaled in a frame 38 secured; to the supporting-frame.' The upper end of shaft 23 also mounted in bracket 38' which may be supported from the axle if springs are interposed between the axle and. the supportingframe. This gearing provides a driving connection f'or the traction-wheel which perm-its each wheel to be turned about its pivot '23 to drive the vehicle in the desired course. .Vihen shaft 36 is,.driven, motion will be communicatedfrbnifigeanwheel 35 to gears 33, 32, 31 and to gear-wheel 30 secured to the traction-wheel. The tracv thereto by a key or groove 42" so as to be driven thereby. 'This shaft is j'ournaled in tion-wheel can be turned about. its swiveled connection by shifting arm 27 without disconnecting the gears.

' wheels atone side at difierential speed with respect tothose at the other side in turning the vehicle and to drive each of them tocorrespond to the'traction and for conjomtly varying the speed of all of the tractionwheels of the vehicle is provided. Said mechanism (see Figs. 1, 2 and .4) comprises an ucljustablepulley E and a pair of adjustable pulleys F and F, all of which are operativcly connected by a belt G. Belt G extends around therims of pulley E, F and F, and around a pair of guide or idlerpullcys 40 mounted in brackets 41 secured to the main-frame. The pulleys E, F and F are conjointly adjustable to drive the connections of the traetion-Wheelsat differcut and graduated speeds from. the primary driving-shaft. Pulleys F and F can be adjusted to vary their relative speed to drive the traction-wheels at one side of the vehicle at difierent speed with respect to the traction-wheels at the other side of the vehicle, the wheel F being connected to positively drive the wheels at one side and the adjustable pulley F being connected-to positively drive the traction-wheels at the other side of the vehicle. Resultantly the speed at which the vehicle travels may be varied as desired and the relative speed of the traction-wheels can be varied to pose tively drive all of them when the vehicle is being turned. y Y

Each of the adjustable pulleys (see Figs. and 6) comprises a pair of sides 41 longitudinally'movable with respect to each other on a shaft and having oppositely arranged inclined guide-bars 42 to which. rim-sections 4-3 are slidably connected by boxes 44. By relative longitudinal movement of the pulley-sides the adjustable rim-sections may be shifted radially and positively inwardly or outwardly to vary the diameter of the rim, thus adjusting thesize of the pulley. Each pulley-side4l isgprovided with a hub 42* and a collar 45, non-revolubly held to hold the pnlley-sideslin assigned position longitudinall-y and against outward movement. A suitable ball-bearing 46, is interposed between the non-revoluble collar 45 and the 1 hub 42? of each pulley-side. When the collars 45 are adjusted longitudinally by mechanism hereinafter described, the pulley-sides are correspondingly shifted to adjust the rim-sections inwardly and out wardly. Each collar 45 is provided with rollers or studs46' with which engages a controller for the pulley. .Each pulley is able'or usual manner.

, connected to its shaft by'a key and groove 42. so one willrevolve wlththeother;

The main driving ptplley' E is. mounted. on a main-driving-sha 48 and is connected bearings 49 secured to frame-bars A and may be connected-to: the motor in any suit- Pulley F is mounted on and operatively connected by key and groove 42 to -a shaft 50 which is usually provided with areversing gear and clutch (not shown) driven by the motor. Shaft 56? is mounted in bearings 51 secured to the vehicle-frame. The. front end of shaft 5&- is connected by universal joints: 52 and 54 and shaft 53 to the driving-connection for the front traction wheel B, and the rear end of said shaft .isv connected by a'nniversal I joint 55, universal joint 57- andshaft 56 to the shaft 36 of the driving-connection for the rear-traction wheel C. Thus the shaft, driven by the pulley F is connected to the front and rear traction-wheels atone side of the vehicle. Pulley F is mounted on a shaft 50, which is mounted in bearings 51 secured to the main frame in any suitable manner and its frontand rear ends respectively are connected to the front and rear driving-connections of the traction-wheels B and C by similar shaft and universal joint connections. This pulley F is operatively connected to and positively drives' ing the speed of the vehicle the relative speed of pulleys F and F is maintained but their speed with respect to the main driving pulley E is varied. the relative speed of the pulleys F and F is varied to drive the traction-wheels according to the course in which the vehicle is traveling. The size of the drive-pulley E is controlled by a pair of vertically slid-able shifters 60, each of the lower'ends of which is provided with a cam-surface 61 adapted to engage the rollers 46 of the adjustingcollars 45 at the o posite sides of pulley E. The upper ends 0 shifter 60 are each connected'by a link 62 to. an arm 63, secured to a rock-shaft 64, which may be operated by screw and worm-wheel 64 to which a handwheel (not shown) on the vehicle is connected, or in any other suitable manner. Said rock-shaft is supported from the frame by brackets 64. By this controlling mechanism the size of the pulley E can be adjusted In steering the vehicle.

lll)

v jtoj drive the vehicle'at any desired speed within the limits'of the adjustment of the pulley;

j The pulleys F and F driven by the belt Gr are conjoint-1y adjusted whenpulley E is shifted, z. 0., whenthe size of the pulley'E [is increased the size of pulleys F andF are correspondingly decreased to retain the belt in operative connection with all of the pulleys.- Each ofthe shifters 60 is guided vertically l)yrollers '67 and 68 and the upper end of'eaeh shifteris provided witha cam surface 70 which engages a stud or roller 69 .on an arm 71 ,whichis secured to arock- 'shaft 72,;journaled inbearings sustained by the frame; Each rock-shaft 72 has rigidly secured thereto a pairof arms 74., the upper ends of which are pivot-ally connected by a stud and slot 75 to a slidalole and laterally movable shifter '76. Each shifter 76 is provided at one .of'its ,endswith a camsurtt'ace 77 in engagement with, one of the adjusting collars ofpulley F and at its other end with camsurfaces 78 in engagement with the adjusting collar 45 of the pulley F".

Clams 77 and 78 when moved inwardly or outwardly simultaneously ad ust the pulleys E and F simultaneously with the adjustinentof pulley E and so that when the size of the pulley E is varied the size of both pulleys 1*" and F will he proportionately varied so the belt will -he retained in operation with respect to the pulleys and without 'Vfll'lfil'lOD of the relativespeed of pulleys F, F. To vary the speed of the vehicle, shifter 130 will be operated longitudinally by controller-shaft (i4. arms (33 and links 62 to shift the adjusting-collars 4-5 of the pulley E and simultaneously cams 70 of shifter 60 will operate rollers (59, arms 71, rock-shafts T2. arms 74, stud and slot-connections 75. shifi'ers-ll'l, to conjointly shift the adjusting rollars .45 of pulleys F, F inwardly or outwardly to correspondingly vary the size of the pulleys F and F with respect to pulley ll. i

The relativespeed of pulleys l and F is -ont.rolled by the steering mechanism and is varial'ile to correspond to the direction in which the wheels travel; the degree of .varialion corresponding to the angle at which the traction s wheels are turned. A steeringshat't $0 is provided at its end with an arm 82 for shitting'the cross-bar 2% for the front traction-wheels and its rear end with a similar crankfi l connected to and for shifting: tliecross-bar', 29 for the reartraction wheels. [The steering-nouneetions are arranged in swing the 'wheels about their swivel-mnuections in opposite directions a like distance to facilitate the turning of the vehicle asindicated in Fig. l. Steering shaft Sdinay be operated by a lover or screw and gear as well understood in the art, and is provided with arms 84- (see Figs.

1, 4 and 5') the upper ends of which are each connected to one of the shifters 76. shifters are shiftedbodily inwardly and outwardly by the speed controlling mechanisin as hereinbe-fore described, and are also slidable longitudinally, the stud and slotconnections 75 being formed to permit in dependent longitudinal movement of these shifters. Wlhen the steering-shaft 80 is operated arms 84!: will cause the shifters 76 to he moved longitudinally and simultaneously so the cams at one end thereof will shift the adjusting collars 45 of one of. the pulleys F, l inwardly while the cams at the other end of the shifters will be adjusted to allow the belt to adjust the other of said pulleys.

W hen the steering-shaft is operated to turnthe steering-wheels, shifters 76 will be simultaneously adjusted to vary the relative size of pulleys F and F" and shaft which drives the traction-wheels at one side of the vehicle will be driven at a different speed than the shaft 50 which drives the tractionwheels at the other side of the vehicle this diiierentiation varyingin degree to correspond to the difference between the curvilinear paths of the wheels and the angles at which the traction-wheels are running. Thus the tractionwheels are positively driven at different relative speeds according drivingsconnections at each of the wheels,

cause all of the traction-wheels to be driven at the same speed. If the operator desires to decrease or increase the speed-of the vehiole he will operateshalit '64: accordingly and thereby arms 63 will operate shifters so the cams hi will ad ust the adjustingcollars' lo of pulley E. Cams of shifters 1 60 will simultaneously operate arms 71, rock-shafts 73, arms .74 and connections to operate the shifters 76 and 7 6' which control the adjustment of pulleys F and F. Said pulleys will he adjusted equidistantly and conjointly to such extent that the belt will be retained in operative relation with all of the pulleys, z'. 6., if the size ofthe pulley E is increased the size of pulley F and to the direction in whiohlthefvehicle is traveling and without any slipping ot' the the size of pulley F will be decreased and vice versa. Therefore, by operation-of shaft (34. the di'ivingmech'anism can be gradually adjusted to drive the vehicle at any desired speed. To steer the vehicle the operator operates shaft 80 which controls cranks 82 and 83 which control the position of the tractionand rear wheels.

wheels. The front and rear traction-wheelsare' shifted thereby in opposite directions respectively to facilitate the turning of the vehicle, the wheels of the front being shifted in substantiallygparallel direction and the rear pair likewise; The shift of the front and rear wheels is such as to cause the rear wheels to travel over the same path as the front wheels. The operation of the controlling mechanismfor steering the tractionwheels alsoetfects adjustment of the driving mechanism to differentially drive the traction-wheels at one side with respect to those on the other side to correspond to the curved paths which they travel respectively. This adjustment is eifected by arms 84 which operate" the shifters 76 longitudinally so the cams at the ends of said shifters will increase the size of one of the pulleys F, F and correspondingly decrease the sizeof the other pulley. Thus each traction-wheel is positively driven at the proper relativejspeed to cause the vehicle to travel in-the course desired and according to the direction of the traction-wheels determined by the steering-mechanism.

The invention possesses some important advantages. It provides a motor-vehicle in' which the-wheels at one .side are positively driven atdifferent relativev speed with re;

- proved drivin mechanism can be readily applied to a vehlcle of this character by omitting the driving connections between shafts 50 and 50, and either the rear or front wheels.

The invention is not to be understood as restricted to the construction shown and de scribed since these may be varied without departing from the spirit and scope of the invention.

Having thus described the invention,

what I claim as new and desire to secure by Letters Patent, is:

.1. In a motor vehicle, the combination of a pair of front and a pair of rear traction wheels each of said wheels having a dirigible connection to the vehicle, driving connections for all of said wheels, and mechanism for driving the connections for the wheels at one side of the vehicle at different relative speed with respect to the driving connections for the wheels at the other side of the vehicle independently of the tractional engagement of the wheels with the ground,

2. In a motor vehicle, the combination of avpair of front and a pair of rear traction Wheels each of said wheels having a dirigible connection to the vehicle, a

connection for both of-the wheels at one side I of the vehicle, a driving connection for both the wheels at the other side of the vehicle, and mechanism for driving said connections at difierent relative speeds to vary the relative speed of the traction wheels independently of the tractional engagement of the wheels with the ground. 1

' 3. In a motor vehicle, the combination of a pair of front and a pair of rear traction wheels each of said wheels having a dirigible connection to the vehicleya driving connection for both of the wheels at one side of the vehicle, a driving connection for both the wheels at the other side of the vehicle, and variable speed mechanism for positively driving said connections at different relative speeds to vary the relative speed of the wheels at one side of the vehicle with respect to the others independently of the tractional enga ement of the wheels with the ground. 4. n a motor vehicle, the combination of a pair of front and a pair of rear traction wheels each of said wheels having a dirigible connection to the vehicle, a driving connection for both of the wheels at one side of the vehicle, a driving connection for both the wheels at the other side of the vehicle, and a variable speed mechanism for positively drivin said connections at different relative spee s to vary the relative speed of the wheels at one side with respect tothose at the other or for driving all of the wheels at the same speed independently of the tractional engagement of the wheels with the ground.

5. In a motor-vehicle, the combination of a pair of front and a pair of rear tractionwheels, each having a dirigible connection to the vehicle, driving-connections for all of said wheels, adjustable mechanism for driving said connections, and means for adjusting said mechanism to drive the connections for the wheels at one side of the vehicle at different speed with respect to the wheels at the other side of the vehicle independently of the tractional engagement of the wheels with the ground.

v 6. In a motor-vehicle, the combination of a pair of front and a pair of rear tractionwheels, each having a dirigible connection to the vehicle, driving-connections for all of said wheels, a variable speed mechanism for positively driving all of said connections,

and means for adjusting the variable speed mechamsm to drive the wheels at one side of the vehicle at different relative speed with respect to the wheels at the other side independently of the tractional engagement of the wheels with; the ground.

7 In a motor-vehicle,the-combination of a pair of front and a paifr of rear tractionwheels each having a variable connection to the vehicle, a drivni connection for both of the wheels at one si e of the vehicle, a driving-connection for both of the wheels at the other side of the'vehicle, a variable speeda pair of front and a pair of rear traction wheels each of said wheels having a dirig ble connection to the vehicle driving connections for each of said wheels, a shaft op'eratively connected to the driving connections for the wheels at one side of the vehicle,another shaft operatively connected to the driving connections for the wheels at the otherside of the vehicle, and mechanism for driving said shafts at 'difierent relative speeds inde' pendentlv ofthe tractional engagement of the wheels with the, ground;

9. In a motor vehicle, the combination of a pair of front and a 'pair of rear traction wheels, each'of said wheels having a dirigible connection to the vehicle driving connections for eachof said wheels, a shaft operatively connected to" the, driving connections for l the wheels at one side of the vehicle, another shaft operatively connected to the driving connections for the wheelsat the other side of the veh cle, and mechanism for drlving said shafts at the same or different relative speeds independently 'ofthe tractional engagement ofthe wheels with the ground.

10. In a motor vehicle, the combination of a pair of front and a pair of rear traction wheels each of said wheels having a dirigible connection to the vehicle, driving connections for each of said wheels, a shaft 'operatively connected to the driving connections for the wheels atone side of the vehicle, another shaft operatively.connected to the driving connections forthe wheels at the other side of the vehicle, and me'ch anism for conjointly varying the speeds of both of said shafts and for driving the shafts at dilferent 'relative speeds independently of the tractional engagement of the wheels with the ground.

11. In a motor-vehicle, the combinationof a pair of front and pair of rear tractionwheels, each having a. dirigible connection to the vehicle, driving-connections for all of said wheels, adjustable mechanism for driving said connections, means for adjusting said mechanism to drive the connections for the wheels at one side of the vehicle at diiferent speed witlrrespect to the wheels at the other side of the vehicle independently of the trnctional engagement of the wheels with the ground, and a steeringdevice connected to all of said wheels and to said adjusting-mechanism to operate it eonjointly with the steering device.

12. In a motor vehicle, the combination of a pair of front and a pair of rear dirigible traction wheels, a driving connection for each of said wheels, a steering-device, mech anism for driving said connections, and

means for varying the relative speed of the driving connections for the wheels at one side of the vehicle with respect to the wheels at the other side {when the steering device is operated.

13. In' amotor vehicle, the combination of a pair of front and a pair of rear dirigible traction-wheels, a driving connection for each of said wheels, a steering-device, variable speed mechanism for drivin said con nections, and means for varying the relative speed of the driving connections for the wheels at one side of the vehicle Withrespect to the-wheels at the other side when the steering device is operated.

14 In a motor vehicle, the combination of a 'pair of front and a pair of rear dirig'ible traction wheels, each having a separate swivel. connection with the vehicle, a driving connection for each of said wheels, driving mechanism. for said connections, a steering device for simultaneously shifting all of said wheels about their swivel connections, means for varying the driving connections of the wheels at one side of the vehicle with respect to those at the other, and means for operating said varying means when the steeringv device is operated.

15. In a motor vehicle, the combination of a pair of front and a pair of rear dirigible traction wheels, each having a separate swivel connection with the vehicle, 'adriving connection for' each of saidwheels, a variable speed driving mechanism for said connections, a steering device tor snnultaneonsly shifting all of said wheels about their swivel connections, means for varying the driving connections ol the wheels at one side of the vehicle with respect to those at the other, and means for operating said varying means when the steering device is operated. I 16. In a motor vehicle, the combination of a pair of front and a pair of rear dirigible traction -wheels, a. driving connection for each of said wheels, driving mechanism for sa-idconnections' comprising a pair of adjl'lstable' pulleys each respectively connected to drive the traction 'wheels at one side of the vehicle, and means for varying the relalLEO live size of said ulleys to drive the wheels at one side at di erential speed with respect to the wheels. at the other side;

17. In a motor vehicle, the combination of a pair of front and a pair of rear dirigible traction wheels, a driving connection for each of said wheels, variable speed driving mechanism for said connections comprising a pair of adjustable pulleys each respectively connected to drive the traction-Wheels at one side of the vehicle, and means for varying the relative size of said pulleys to drive the wheels atone side at differential speed with respect to the wheels at the other side.

18. In a motor vehicle, the combination of a pair of front and a pair of rear dirigible traction Wheels, a driving connection for each of said wheels, driving mechanism for said connections comprising a pair of adjustable pulleys each respectively connected to drive the traction-wheels at one side of the vehicle, means for varying the relative size of said pulleys to drive the wheels at one side at differential speed with respect to the wheels at the other side, and means for conjointly adjusting said pulleys without varying their relative size.

19. In a motor vehicle, the combination of a pair of front and a pair of rear dirigible traction -wheels, a driving connection for each of said wheels, driving mechanism for said connections comprising a pair of adjustable pulleys'e'a'ch respectively connected to drive the traction-wheels .at one side of the'vehiole, a belt connecting said pulleys and means for varying the relative size of the pulleys to drive the wheels at one side of the vehicle at diiierent speed with respect tothose at the other.

20. In a motor vehicle, the combination of a pair of front and a pair of rear dirigible traction -wheels, a driving connection for each of said wheels, a variable speed driving mechanism for said connections comprising a pair of adjustable pulleys each respectively connected to drive the traction-wheels at one side of the vehicle, a belt connecting said pulleys and means for varying the relative size of the pulleys to drive the wheels at one side of the vehicle at diflerent speed with respect to those at the other.

21. In a motor vehicle, the combination of a pair of front and a pair of rear dirigible traction-wheels, a driving connection for each of said wheels, driving mechanism for said connections comprising a main drive pulley, a pair of adjustable pulleys each con nected to the driving connections for the wheels at one side of the vehicle, a'belt connecting all of said pulleys, and means for varying the relative size of said pair of pulleys to drive the wheels at one side at a difierent speed with respect to those at the other.

22. In a motor vehicle, the combination of apair of front and a pair of rear dirlgible traction wheels, a driving connection for each of said Wheels, driving mechanism, a main adjustable pulley, a pair of adjustable pulleys each connected to the driving connections at one side of the vehicle respectively, a belt connecting all of said pulleys, means for adjustingall of said pulleys conjointly, and means for varying the relative size of said pairof pulleys.

23. In a motor vehicle, the combination of a pair of traction wheels, a driving'connection for each of said wheels, and mechanism for driving said connections comprising a pair of pulleys havin a belt connecting the pu eys, and means for conjointly adjusting" the rims of said pulleys.

24. In a motor vehicle, the combination of a pair of dirigible traction-wheels, a driving connection for each of said wheels and driving mechanism comprising a pair of adjustable pulleys each having adjustable rims, a belt connectin the pulleys, and means for conjointly a justing the rims of an adjustable rim,

said pulleys to vary the relative speed of the driving connections.

25. In a motor vehicle, the combination of a pair of dirigible traction wheels a driving connection for each of said wheels, driving mechanism for said connections comprising a pair of pulleys each having adjustable rims, a belt connecting the ulleys, means for conjointly adjustin the rims of the pulleys to vary the relatlve speed and means for conj ointly adjusting the alleys to maintain the same relative speed 26. In a motor vehicle, the combination of a pair of dirigible traction wheels, a driving connection for each of said wheels, driving mechanism comprising a pair of pulleys each having adjustablerims, a belt connecting the pulleys, shifting mechanism for correspondingly adjusting said pulleys and shifting mechanism whereby the pulleys may be adjusted to vary their relative sizes.

27. In a motor vehicle,'the combination of traction wheels, driving connections for said wheels and driving mechanism for said connections comprising a air of pulleys having adjustable rims, and a belt connecting the pulleys, and means for adjusting the pulleys to vary the speed of the driving connections.

28. In a motor vehicle, the combination of traction-wheels, driving connections for the wheels, driving mechanism for said connections comprising a pair of pulleys each con prising adjustable sides and rim sections.- a belt connecting the pulleys and means for adjusting the pulley sides to vary the speed of the driving connections.

, 29. In a motor vehicle, the con'ibination of lua in vadjustable drivil lg pulley;

all of said pulleys t9 Vary the speed of the 7 driving conneetions.

I 30. In a motor vehicle, the combination of traction-Wheels, driving connections for said wheels, driving" 1nechanism= comprising a main adjust-able driving pulley, a pair of adjustable pulleys and a belt eonneeting the of said pulleys to vary the speed of the driving conneetions, and meens for relatively edjusting theseid pair to vary the reletlx espeed-0f the driving cennectipns.

' t v STEPHEN B GRAY.

' Witnesses:

CHAS. O.- SHERV'EY,

v LESUR S. RUSSELL.

Va yea i1 ofli' (pulleys, means for conjoint 1y edjusting all 

